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Seventh Crusade: Crusaders engage Ayyubid forces in the Battle of Al Mansurah.
The U.S. Second Continental Congress passes a resolution that the services of Gilbert du Motier, Marquis de Lafayette "be accepted, and that, in consideration of his zeal, illustrious family and connexions, he have the rank and commission of major-general of the United States."
The EBR-1 in Arco, Idaho becomes the first nuclear power plant to generate electricity. The electricity powered four light bulbs.
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